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package org.apache.doris.nereids.trees.expressions.functions;

import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.literal.Literal;

/** monotonicity of expressions */
public interface Monotonic extends ExpressionTrait {
    // true means that the function is an increasing function
    boolean isPositive();

    // return the range input child index
    // e.g. date_trunc(dt,'xxx') return 0
    int getMonotonicFunctionChildIndex();

    // return the function with the arguments replaced by literal
    // e.g. date_trunc(dt, 'day'), dt in range ['2020-01-01 10:00:00', '2020-01-03 10:00:00']
    // return date_trunc('2020-01-01 10:00:00', 'day')
    Expression withConstantArgs(Literal literal);
}
